CN115792310B - On-site experiment device and method for switching all-in-one machine - Google Patents
On-site experiment device and method for switching all-in-one machine Download PDFInfo
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Abstract
The application provides a field experiment device and method for a switching all-in-one machine. The on-site experiment device capable of flexibly changing the circuit communication mode is arranged in the gas insulation pipeline, so that electric connection is flexibly provided for the transformer, the GIS equipment and the corresponding experiment equipment according to the experiment requirement. Therefore, the gas insulation pipeline can compress the insulation distance required by the field experimental device, and the conductor paths can be flexibly switched through the conductive cores and the conductive tee structures in the field experimental device, so that switching between different states is realized, the preparation process of test lines and material equipment before the test is simplified, the test efficiency is improved, and the test cost is saved. The field test device can be specially used for providing an electric path between the transformer and the GIS equipment for the switching-on and switching-off integrated machine under the normal working state after detecting the high-voltage switch and the transformer, can effectively avoid idle waste of the test device and provides convenience for daily maintenance work.
Description
Technical Field
The application relates to the field of high-voltage equipment of transformer substations, in particular to a field experiment device and method for a switching all-in-one machine.
Background
The most common form of on-site handover test of a transformer substation is that a transformer and a high-voltage switch are separated to perform relevant tests respectively.
For a transformer substation adopting an air insulation technology, when a transformer field test or a GIS equipment field test is carried out, the transformer or the high-voltage switch is correspondingly connected to the test equipment through an open type connection structure. Air is used as an insulating medium to connect the test equipment with the transformer and the test equipment with the high-voltage switch. The open air insulation technology is affected by external environmental factors such as humidity and altitude, and needs to keep a sufficient safety distance according to the regulation requirement of rated voltage class during operation. In order to meet the insulation distance index, the existing transformer substation field test equipment generally occupies a large area of space, and the existing transformer substation field test equipment cannot meet the urban construction requirement of scarce land resources.
In addition, the air insulation connection structure adopted by the existing transformer substation test device is required to be connected with the outdoor high-voltage transformer and the GIS equipment in a split-phase mode, and each phase of signal of the transformer substation is required to be provided with an independent circuit and insulation distance of each phase of signal is ensured respectively. Therefore, the circuit connection structure of the existing transformer substation field experimental device cannot be compactly arranged, and a large amount of installation space is wasted to meet the insulation distance requirement.
For a transformer adopting an oil-sulfur hexafluoride gas sleeve, the sleeve structure is relatively closed and cannot be adjusted, so that the related test cannot be directly carried out on the oil-sulfur hexafluoride gas sleeve by the existing sulfur hexafluoride gas-insulated transformer equipment. In the test, a set of transition test device provided with an oil-air sleeve is added on the basis of the existing equipment structure of the transformer to realize the electric connection of test equipment.
In the traditional scheme, if the transformer of the oil-SF 6 is connected with GIS equipment, different test tools are also needed to be connected with the transformer and the GIS equipment respectively, and then corresponding tests can be carried out. Connection and installation work between the two devices can be carried out after the transformer and the GIS device are tested respectively. Because a great deal of effort is consumed for carrying out equipment test before the installation process, the prior art is difficult to ensure the connection quality of the equipment installation process, and is also difficult to carry out accurate and effective test and assessment on the validity of the connection position.
Therefore, in the conventional method, a large amount of test materials are required to be prepared and a large amount of time and effort are consumed when the transformer is tested on site, regardless of the connection technology.
Disclosure of Invention
The application provides a field experiment device and method of a switching all-in-one machine aiming at the defects of the prior art, and the field experiment of a transformer and a high-voltage switch can be completed through the same set of experiment device and experiment sleeve by changing the connection mode of an internal conductor. The application specifically adopts the following technical scheme.
Firstly, in order to achieve the above-mentioned object, a field experimental device of a switching all-in-one machine is provided, which is hermetically connected in a gas-insulated pipeline between a transformer and a GIS device, and includes: one end of the conductive core is detachably and electrically connected with the test equipment, and the other end of the conductive core is detachably connected with a conductive tee structure; the conductive tee joint is structurally and detachably connected with two conductors, one conductor is connected with the inner core of the gas insulation pipeline at one side of the transformer, and the other conductor is connected with the inner core of the gas insulation pipeline at one side of the GIS equipment; when a transformer field test is carried out, one end of the conductive core is electrically connected with test equipment, one of the conductors is electrically connected with the transformer, and the other conductor is detached and disconnected from the electrical connection between the GIS equipment; when a high-voltage switch field test is carried out, one end of the conductive core is electrically connected with test equipment, the conductive tee structure at the other end is disassembled to disconnect the electrical connection between one of the conductors and the transformer, and the other conductor is connected to keep the electrical connection with GIS equipment; in any power-on state, the field experiment device and the gas insulation pipeline keep internal through, and the conducting core, the conducting tee structure and the pipelines of the two paths of conductors are filled with insulation gas meeting the test air pressure requirement.
Optionally, in any one of the above opening and transformation integrated machine field experiment device, in a non-test state, the conductive core in the field experiment device is removed from the gas insulation pipeline, and the transformer and the GIS device are electrically connected by a conductive tee structure and a conductor sealed in the gas insulation pipeline.
Optionally, the on-site experimental device of the all-in-one switching machine according to any one of the above, wherein the conductive core is a straight pipe conductor with two ends respectively provided with a plug connector, the plug connector at one end of the conductive core is connected with a test sleeve equalizing ball, and the plug connector at the other end of the conductive core is connected with a conductive tee structure; one side of the test sleeve voltage equalizing ball is connected with the straight pipe conductor in an inserting mode, the other side of the test sleeve voltage equalizing ball is electrically connected with the test sleeve, and the test sleeve is electrically connected with corresponding test equipment.
Optionally, the on-site experimental device for the all-in-one machine according to any one of the above, wherein the conductive tee joint structure is an inserting contact provided with three groups of inserting ports, the surface of the inserting contact is provided with a smooth spherical surface, and the three groups of inserting ports are respectively concave in the spherical surfaces and are arranged in different directions.
Optionally, the on-site experimental device for the all-in-one switching machine according to any one of the above embodiments, wherein the plug contact is disposed at a bent portion of the gas insulation pipeline, a detachable conductor is respectively connected between the plug contact and each path of conductor, and between the plug contact and the straight pipe conductor, and the detachable conductor is electrically connected with the plug interface in a plug manner.
Optionally, the on-site experimental device for a switching all-in-one machine according to any one of the above, wherein in a non-experimental state, the detachable conductor between the plug contact and the straight tube conductor is detached and the electrical connection is disconnected; when the transformer field test is carried out, the dismounting conductor between the plug contact and the conductor connected with the GIS equipment is dismounted to be disconnected electrically, and the plug contact is connected with the dismounting conductor connected with the transformer in a plug manner to be kept electrically; when the high-voltage switch field test is carried out, the dismounting conductor between the plug contact and the conductor connected with the transformer is dismounted to be disconnected electrically, and the plug contact is connected with the dismounting conductor between the conductor connected with the GIS equipment in a plug manner to be kept electrically connected.
Optionally, the on-site experimental device for the all-in-one machine according to any one of the above, wherein the plug contact further sets a plug-in port for disassembling and assembling the conductor to be plugged and sealed by a ball head shield, and the outer peripheral surface of the ball head shield is in smooth transition with the surface of the plug-in contact.
Meanwhile, the application also provides a field experiment method of the field experiment device for the field experiment device, which is used for installing the field experiment device, and comprises the following steps: before a transformer field test is carried out, firstly discharging insulating gas in the field test device, dismantling electrical connection between a conductive tee structure and a conductor connected with GIS equipment, keeping the electrical connection between the conductive tee structure and the conductor connected with the transformer, and then supplementing the insulating gas into the field test device to recover to meet the test air pressure requirement; when the high-voltage switch field test is carried out, firstly, discharging insulating gas in the field test device, dismantling electrical connection between the conductive tee structure and a conductor connected with the transformer, keeping the electrical connection between the conductive tee structure and the conductor connected with the GIS equipment, and then supplementing the insulating gas into the field test device to recover to meet the test air pressure requirement; the field experimental device is electrically connected with the experimental equipment through the experimental sleeve.
Optionally, in any one of the above field test methods, when the device is switched to the non-test state, firstly discharging the insulating gas in the field test device, dismantling the electrical connection between one end of the conductive core and the test device, maintaining the electrical connection between the conductive tee structure and the conductor connected with the GIS device and the conductor connected with the transformer, and then supplementing the insulating gas in the field test device to recover to meet the operating air pressure requirement.
Alternatively, a field test method as defined in any one of the preceding claims, wherein, in the non-test state, the test sleeve to which the test device is connected is removed from the field test device or remains at the end of the field test device.
Advantageous effects
The application provides a switching all-in-one field experiment device and method, it can be through changing the internal conductor connected mode, set up high voltage switch, transformer into the field test demand that shares a set of test device and can satisfy transformer and high voltage switch, reduce the required preparation material of transformer, high voltage switch field test, compare the conventional mode and reduce the demand to the required resource of test, still can practice thrift a large amount of test preparation time.
In addition, the test device that this application provided dismouting is convenient, only needs to reserve a test device interface on high tension switch and can realize dismantling the equipment through this interface. After the field tests of the transformer side and the GIS equipment side are completed, the reserved interface can be further used as an overhaul window of the high-voltage switch for recycling.
The test device can also be provided for a transformer substation as an independent module. The device can be always kept on equipment to run after the field test is completed, and can be flexibly disassembled according to the requirements of the use scene so as to be used for the field test of other products.
Additional features and advantages of the application will be set forth in the description which follows, and in part will be obvious from the description, or may be learned by practice of the application.
Drawings
The accompanying drawings are included to provide a further understanding of the application and are incorporated in and constitute a part of this specification, illustrate and explain the application and do not limit it. In the drawings:
fig. 1 is a schematic diagram of an overall structure of a switching all-in-one machine provided in the present application
Fig. 2 is a schematic diagram of a structure of an insulation connection pipeline of a GIS device in the switch-on integrated machine of the present application;
FIG. 3 is a schematic structural view of the three-phase common-box pipeline in FIG. 2;
fig. 4 is a schematic structural view of the conductive core in the three-phase common-box pipeline shown in fig. 3;
FIG. 5 is a schematic view of the structure of the inner conductive core of the test device used in the present application;
FIG. 6 is a schematic diagram of the connection of the internal conductive cores of the test device shown in FIG. 5 in different states.
The marks in the figure: 1 represents a transformer; 2 represents a high-pressure oil-SF 6 sleeve; 3 represents a low-pressure oil-gas separator; 4 represents a gas insulated pipeline; 5 represents a test device; 6 represents GIS equipment; 7 denotes a neutral point device; 8 represents a neutral point oil-SF 6 casing; 9 denotes a common base platform; 401 denotes a common box busbar; 701 represents a transverse sealing conduit connection port; 702 represents an insulating tube hand hole; 801 represents a straight barrel conductor; 802 denotes a transfer conductor; 803 denotes an insulator contact; 804 represents a basin insulator; 901 denotes an entire test sleeve; 902 represents a straight tube conductor; 903 denotes a detachable conductor; 904 represents a plug contact; 905 denotes a test sleeve pressure equalizing ball; 906 denotes a ball nose shield.
Detailed Description
In order to make the objects and technical solutions of the embodiments of the present application more clear, the technical solutions of the embodiments of the present application will be clearly and completely described below with reference to the drawings of the embodiments of the present application. It will be apparent that the described embodiments are some, but not all, of the embodiments of the present application. All other embodiments, which can be made by one of ordinary skill in the art without the benefit of the present disclosure, are intended to be within the scope of the present application based on the described embodiments.
It will be understood by those skilled in the art that, unless otherwise defined, all terms (including technical and scientific terms) used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application belongs. It will be further understood that terms, such as those defined in commonly used dictionaries, should be interpreted as having a meaning that is consistent with their meaning in the context of the prior art and will not be interpreted in an idealized or overly formal sense unless expressly so defined herein.
The meaning of "and/or" as referred to in this application means that each exists alone or both.
The meaning of "inner and outer" as used herein means that the direction pointing to the inside of the metal shell is inner and vice versa with respect to the gas insulated pipe itself; and not as a specific limitation on the device mechanisms of the present application.
As used herein, "connected" means either a direct connection between elements or an indirect connection between elements via other elements.
The meaning of "up and down" in this application refers to that when a user is facing the switch-on and switch-off integrated machine, the direction from the common base platform to the top oil tank of the transformer is up, and vice versa, but not the specific limitation of the device mechanism of this application.
Fig. 1 is a switching all-in-one machine provided according to the present application as part of a high voltage device of a substation, comprising a transformer 1, a GIS device 6 and a neutral point device. Wherein, the GIS equipment 6 and the neutral point equipment are fixedly connected to the transformer 1 by the gas insulation pipeline 4 to form a whole.
The transformer 1 and the GIS equipment are connected through a high-voltage outlet end arranged on one side of the top of the transformer box body, and the gas insulation pipeline 4 is arranged close to the GIS equipment installation area, so that the electric connection is realized through a conductor inner core which is sealed by insulating gas inside the gas insulation pipeline 4; the low-voltage outlet end of the transformer can be correspondingly arranged on the other side of the top of the transformer box body and far away from the GIS equipment so as to avoid mutual interference between the GIL power transmission pipeline connected with the low-voltage outlet end and the high-voltage end gas insulation pipeline 4. In practice, the high-voltage outlet end of the transformer can be insulated and sealed by a closed high-pressure oil-SF 6 bushing 2, and the high-pressure oil-SF 6 bushing 2 is connected to GIS equipment and a transformer field experimental device by a gas insulation pipeline 4; the low-voltage outlet end of the transformer can be insulated and sealed by sealing the low-voltage oil-gas isolating device 3 and is connected to the GIL transmission pipeline;
The GIS device 6 may be preferably arranged to be mounted on one side of the transformer tank in a direction parallel to the long axis of the transformer 1, depending on the installation conditions. The transformer box body and the GIS equipment can be arranged side by side, so that the installation space is saved, and corresponding neutral point equipment and oil circuit heat dissipation equipment are installed by utilizing the space at the front end and the rear end of the transformer box body; the GIS device 6 of the present application is also insulated and sealed by a gas-insulated metal pipe structure, and the metal pipe is filled with sulfur hexafluoride gas as an insulation stop. The GIS equipment and the gas-insulated metal pipeline can be connected with the high-pressure oil-SF 6 sleeve 2 or connected by a three-phase parallel pipe;
the neutral point equipment to which the transformer is connected in the present application is preferably connected with the neutral point of the transformer 1 in a sealed manner through a set of independently arranged gas-insulated pipelines, and the neutral point complete equipment is sealed in an insulating manner through a sulfur hexafluoride gas-insulated metal pipeline. The gas insulation pipeline of the neutral point complete device and the neutral point outlet end of the transformer can be electrically connected through a neutral point oil-SF 6 sleeve 8 in general, signals output by the neutral point of the transformer are received, and insulation distance required by neutral point equipment is compressed by utilizing a fully-closed shell structure;
The gas insulation pipeline 4 is hermetically connected between the high-voltage outlet terminal of the transformer 1 and the GIS equipment 6, is internally filled with insulation gas and is provided with an electric path for connecting the high-voltage outlet terminal of the transformer and the GIS equipment, and is also reserved with a test device interface so as to install a field test device as a part of a high-voltage switch on the reserved pipeline interface of the high-voltage switch, and different circuit on-off states are provided to flexibly realize detection of the transformer or the GIS equipment. After the field experiment detection is completed, the field experiment device can be further arranged to disconnect the connection between the test equipment and the high-voltage switch and the transformer under the normal operation state of the switching-on and switching-off integrated machine so as to avoid the interference to the normal operation state of the switching-on and switching-off integrated machine. After the field experiment detection is completed, under the state that the switching all-in-one machine normally operates, the conductive core, the conductive tee joint structure and the test sleeve 901 for providing the electric signals of the test equipment of the field experiment device can be reserved on the gas insulation pipeline 4 of the high-voltage switch, so that the preparation time for the subsequent relevant tests is shortened. The conducting core, the conducting tee structure, the test sleeve 901 and other test devices can be removed after the test is finished, and the interface of the removed reserved pipeline of the high-voltage switch is sealed by a cover plate.
From this, this application through the dismantled and assembled design to the inside conductive structure of gas-insulated pipeline, can be nimble according to the use scene needs and adjust the electric connection relation between transformer and the GIS switchgear among the all-in-one of opening, through the required insulating distance of traditional overhead line connection between each equipment of effective compression, and then the required space resource who occupies of compression transformer substation, simplify the step of assembling electric connection circuit in the experiment. According to the method, on the basis that the connection between the transformer and the GIS equipment, the neutral point complete device and the low-voltage outlet is designed to be in a full-insulation connection mode, the conductor circuit structure capable of being detached and replaced in connection relation can be further arranged in the gas closed pipeline in a sealing mode, the influence of severe natural climate environment and external small animals on the test is resisted, the system safety coefficient is improved, and the corresponding field experimental device pipeline hardware structure is flexibly arranged in the pipeline, so that the insulation distance required by the compression test equipment is shortened.
According to the switch-on all-in-one machine provided by the embodiment, the high-voltage side, the low-voltage side, the neutral point and the connected GIS (gas insulated switchgear) are exposed in the air, so that the insulation distance required to be reserved outside the electrified equipment is not required to be considered, and therefore, the interval distance between the equipment can be directly compressed to only meet the minimum mechanical distance required by installation between the equipment, so that arrangement and installation between the transformer, the GIS and other equipment are more compactly realized, the field installation area required by the switch-on all-in-one machine is further compressed, and the switch-on all-in-one machine and the utilization rate of the field area are improved.
In order to further ensure that the electric connection structure of each circuit device among the transformer, the GIS switch system and the neutral point device is stable in the opening and transformation integrated machine, and assembly errors are not easy to generate due to carrying vibration or natural sedimentation in the transportation process of the opening and transformation integrated machine, the transformer 1, the GIS equipment 6 and the neutral point equipment are preferably welded and fixed on the same common foundation platform 9 together; and correspondingly, a group of oil-SF 6 bushings are respectively arranged at the high-voltage outlet end and the neutral point outlet end of the transformer to serve as a high-voltage oil-SF 6 bushing 2 and a neutral point oil-SF 6 bushing 8. The low-voltage outlet end of the transformer can be sealed by a low-voltage oil-gas isolating device 3. The sleeve structures of the wire outlet ends can be respectively arranged according to the three phases of the transformer wire outlet, and the three phases of the transformer wire outlet ends can be jointly integrated to realize sealing by the same sleeve pipe shell.
According to the transformer 1, the GIL pipeline connected between the high-voltage outlet terminal and the GIS equipment, the GIL pipeline connected with the low-voltage outlet terminal of the transformer and the neutral point equipment connected with the neutral point outlet terminal can be wrapped by a gas insulation pipeline shell, and a corresponding conductive inner core or an electrical component can be arranged in the gas insulation pipeline 4 to realize an electrical passage function or a switching response. The gas insulated pipeline can be correspondingly provided with a field test device according to the adjustment requirement on the connection relation of the electric path in the field test. The field test device and the neutral point equipment can be sealed by a metal tube shell filled with sulfur hexafluoride gas reaching proper pressure or proper concentration. In the specific installation, the gas-insulated pipeline 4 of the field test device is arranged, and can be adjusted to realize fixed connection with the high-pressure oil-SF 6 sleeve 2 through one end of the pipeline so as to correspondingly input an electric signal triggered by test equipment to the high-voltage side of the transformer in the test state. The other end of the gas-insulated pipeline 4 of the installation field test device can be fixedly connected with GIS equipment, so that test signal feed-in to the GIS end is realized in the field test process, and whether the specific running state of the GIS equipment is accurate or not is detected. In this embodiment, the three-phase-separated wires at the high-voltage wire outlet side of the transformer can be connected with the three-phase common-box wire inlet structure of the GIS device by using the internal conductor structures independently arranged in the pipelines through the pipeline structures shown in fig. 3 and 4.
In order to flexibly detect the operation state of each main circuit device in the switching integrated machine system and ensure the stable operation of the switching integrated machine, the application can further connect a group of test devices 5 in the gas-insulated pipeline 4. The inside seal of test device 5 is provided with the conducting core, the one end detachably of conducting core is connected with test equipment electricity, the other end detachably of conducting core passes through two way conductors of electrically conductive tee bend structure connection. One end of the conductive tee joint structure is kept connected with the test sleeve through the conductive core, and the other end of the conductive tee joint structure is correspondingly connected with the transformer 1 and the GIS equipment 6 through two paths of conductors according to test or operation requirements. When a transformer field test is carried out, the other end of the conductive three-way structure is connected to the side of the transformer through one of the conductors and a corresponding gas insulation pipeline 4, and the conductor at the side of the high-voltage switch is in an on-off state with the conductive three-way structure; when the high-voltage switch field test is carried out, the other end of the conductive tee structure is connected to the high-voltage switch side conductor through one of the conductors and the corresponding gas insulation pipeline 4, and the conductive tee structure of the transformer side conductor is in an on-off state. In order to avoid the problem that the ignition of the conductor structure in the pipeline under a high-voltage state affects the stability of the system, the conductive tee structure is preferably arranged into a tee ball socket contact 904 with three groups of socket interfaces in the application so as to ensure that the end head of the conductor in the disassembly state is smooth and flat and the phenomenon of point discharge ignition is not easy to occur. The plug contact 904 can be directly connected with the corresponding conductor structure in a plug and fixing manner to realize electric connection, and can also realize electric connection through a dismounting conductor 903 of the conductor end in the connecting pipeline. The test device 5 can be used as a temporary test, and can also be used for only removing a test tube nut and a test sleeve connected to one end of the test device according to product requirements after the test is finished so as to reserve the conductive inner core of the test device in the gas insulation pipeline 4, and realizing an electric connection path between the transformer 1 and the GIS equipment 6 by multiplexing the test device. The connection mode of the conductive core in the test device 5 can be changed, and when the conductive core structure is arranged to connect the test sleeve and the transformer 1, the relevant field test of the transformer can be carried out; when the conductive core in the test device 5 is arranged to communicate the test sleeve with the GIS equipment 6, the GIS equipment 6 can be subjected to field test.
That is, when a transformer field test is required, the test device 5 can be electrically connected with the test equipment through the first end of the internal conductive core, while one conductor passing through the second end is kept electrically connected with the transformer 1 by utilizing the internal electric path of the gas insulation pipeline 4, and the other conductor correspondingly keeping the second end is disconnected with the GIS equipment 6 to temporarily cut off the GIS for test, and in the test process, the test device 5 and the gas insulation pipeline 4 are refilled with sulfur hexafluoride gas and the pipeline is kept to run through to meet the test air pressure requirement;
when the high-voltage switch field test is performed, the test device 5 can be electrically connected with the test equipment through one end of the inner conductive core, one path of the conductor at the second end is kept disconnected with the transformer 1, and the test is performed by using the other path of the conductor at the second end to keep stable electrical connection between the test equipment and the GIS equipment 6 through the inner electrical path of the gas insulation pipeline 4, and in the test process, the test device 5 and the gas insulation pipeline 4 are kept to be communicated and refilled with sulfur hexafluoride gas meeting the test air pressure requirement.
In the non-test state, the test device 5 belongs to an optional accessory, and can be selectively removed from the gas insulated pipeline 4 after the field test is finished, or can be selectively reserved. When the retention test device 5 is selected, the retention test device can be fixedly connected with the high-voltage switch gas-insulated pipeline 4 so as to communicate the transformer 1 with the high-voltage switch GIS equipment 6 through the internal conductor of the test device, and the electric connection between one end of the test device 5 and the test equipment is removed so as to avoid the interference brought by the test device and ensure the operation of the transformer. The transformer 1 and the GIS equipment 6 are stably and electrically connected by a gas insulation pipeline 4 filled with sulfur hexafluoride gas and kept sealed.
In order to further reduce the length of the gas-insulated pipeline 4, improve the integration level of the all-in-one equipment as much as possible, reduce the requirement on the installation space, in the preferred embodiment, three-phase coils inside the transformer 1 can be arranged along the long axis direction of the box body, and in the three-phase coils:
the top of the three-phase high-voltage coil can correspondingly lead out three-phase high-voltage outgoing terminals from the top cover of the transformer box body in a vertical upward direction. The transformer top cap can be heightened to be arranged to protrude out of the top plate of the transformer box body, and hand holes can be arranged on the main structure of the transformer box body to provide an operation space, so that installation staff can conveniently install and connect the high-pressure oil-SF 6 sleeve to the three-phase high-voltage outlet end. The three-phase high-voltage outlet wire ends can be arranged in a split phase mode, are respectively sealed in a butt joint mode through three independently arranged high-voltage oil-SF 6 bushings arranged on one side of the top of the transformer box body in a straight mode, and lead out one phase of the high-voltage outlet wire of the transformer to the gas insulation pipeline 4 through the high-voltage oil-SF 6 bushings. Each high-pressure oil-SF 6 sleeve can be vertically arranged on the top cover of the main structure of the transformer, and each high-pressure oil-SF 6 sleeve is respectively in butt joint with the gas insulation pipeline 4 through the high-pressure interface conductive inner core pipeline thereof, is in sealing connection with the gas insulation pipeline 4 and keeps stable electric connection.
In particular, the gas-insulated pipe 4 connected between the transformer 1 and the GIS device 6 may be provided to include the one shown in fig. 2:
the high-voltage interface is provided with an L-shaped bending part at the right side of the figure 2, the outer part of the high-voltage interface is completely sealed by a metal shell, and a conductive inner core closely butted with a high-voltage outlet end conductor of the transformer is arranged in the inner part of the high-voltage interface along the central axis direction of the pipeline. The gas insulation pipeline 4 can adopt a structure shown in the middle part of fig. 2, and three independent high-voltage interfaces are separately arranged on one side of the three-phase shell respectively for the three-phase high-voltage outgoing ends of the transformer. One side of the three high-voltage interfaces is welded and sealed with the three-phase main pipe shell, and the other side of the three high-voltage interfaces is respectively and hermetically connected with a corresponding-phase high-pressure oil-SF 6 sleeve connected with the three-phase high-voltage wire outlet end of the transformer;
the three independent high-voltage interfaces can be arranged into a transverse sealing pipeline structure shown on the right side of fig. 2, are respectively horizontally led out from each high-voltage interface, are hermetically connected to the same three-phase main pipe shell, and are stably and electrically connected with the conductors in the three-phase common-box pipeline 401;
the three-phase common-box pipeline shell can be provided with three branch interfaces at positions close to the high-pressure oil-SF 6 sleeve so as to be connected to the transverse sealing pipelines of the high-pressure interface end respectively, and conductors in the branch interfaces can be provided with bending structures shown in fig. 4 so as to transmit signals of the transverse sealing pipelines into the three-phase common-box pipelines, and the signals of the three-phase common-box pipelines are connected to GIS equipment through three conductors in the three-phase common-box pipelines respectively. The test device 5 may be disposed at a bent portion similar to the upper left corner of the three-phase common box pipeline of fig. 2, and receives test signals through a port at the outer side of the test device 5 to detect the operation state of the transformer or the GIS device. The conductive inner cores made of metal materials are arranged in the pipelines, and can be supported by the pipeline structures, fixedly connected and form an insulating gas channel which is communicated inside. The metal corrugated expansion joint can be further installed at the joint position of each pipeline, so that the assembly error in the pipeline installation process is compensated through the telescopic deformation of the corrugated pipe, and meanwhile, the problem that the stability of the internal conductive inner core electric connection structure is influenced due to the fact that the pipeline is pulled to cause the deformation of the hard connection structure of the pipeline due to uneven settlement of the basic supporting structure after equipment assembly is avoided. Specifically, the conductive inner cores of the three-phase common-box pipeline can be led out from one end, close to the high-voltage side of the transformer, of the three-phase common-box pipeline respectively, and are turned along the branch interfaces of the pipeline, and the three-phase common-box pipeline is connected to the corresponding transverse sealing pipelines of each phase respectively through the three-phase switching conductor 802. And the other end of the three-phase common-box pipeline can support the conductive inner core of the three-phase common-box pipeline through an insulating flange structure to realize stable electric connection with each phase circuit structure inside the GIS equipment 6.
The GIS equipment connected with the method generally does not need to limit the specific device types and pipeline connection modes. As long as the GIS equipment is connected with a common box bus at one end of the gas pipeline, the three-phase high-voltage signal of the transformer or the test signal of the test device is fed into the GIS equipment through the internal conductor of the common box bus, the grounding switch, the isolating switch, the circuit breaker inside the GIS equipment can be triggered, and corresponding functions are realized through a current transformer, a lightning arrester and a voltage transformer and the isolating switch which are arranged beside the lightning arrester and are arranged between the circuit breaker and the connection of the cable terminal. The GIS devices also regulate and control the switch devices through an in-situ control cabinet arranged beside the GIS devices.
In the specific implementation shown in fig. 5 and 6, the test device 5 used in the present application may include a test tube (omitted in the drawings, in practice, the test tube may be sealingly disposed on the periphery of the conductive connection path in fig. 5 and 6, and may be sealingly connected with the gas-insulated pipe 4 to provide gas insulation together with the conductive connection path). The test sleeve is arranged on the test sleeve, one end of the test sleeve is connected with one end of the gas insulation pipeline, the test sleeve is electrically connected with the gas insulation pipeline through an internal conductor, so that the test sleeve is used for receiving pressurization required by the field test of the transformer, and the conductor in the test sleeve, the test sleeve and the common box bus of the GIS equipment is used for providing an electric passage, so that the field test of the GIS equipment is carried out when the test sleeve is pressurized. The test device can be kept on the opening and changing integrated machine according to actual requirements, or the test tube nut and the test sleeve are removed after the test is selected. After disassembly, a bulb shield can be further arranged on the inner conductor of the experimental device to avoid ignition, and a cover plate for the corresponding gas-insulated pipe bus is arranged for sealing. The test tube nut can be provided with the following structure which is sealed by a gas-insulated metal shell:
A straight pipe conductor 902, one end of which is provided with a test sleeve equalizing ball 905, and the other end of which is provided with a plug contact 904;
the test sleeve equalizing ball 905 is detachably and electrically connected with the test sleeve 901, and is connected with corresponding test equipment through the test sleeve 901;
the plug contact 904 is detachably connected with two paths of conductors, and the two paths of conductors are respectively connected with the transformer 1 and the GIS equipment 6 at two ends of the gas insulation pipeline 4, so that an electric connection path between the test sleeve 901 and the transformer 1 or the GIS equipment 6 is adjusted according to test requirements.
The plug contact 904 is preferably disposed at a bent portion of the gas-insulated pipe 4, and the plug contact 904 and each path of conductors, and the plug contact 904 and the straight pipe conductor 902 are electrically connected by plugging with the detachable conductor 903. Thus, in the non-test state, the detachable conductor 903 between the plug contact 904 and the straight pipe conductor 902 is detached, and the electrical connection is broken; when a transformer field test is required, the dismounting conductor 903 between the plug contact 904 and the conductor connected with the GIS equipment 6 is dismounted, and the electrical connection is disconnected; when the high-voltage switch field test is required, the detachable conductor 903 between the plug contact 904 and the conductor to which the transformer 1 is connected is detached, and the electrical connection is broken. After the test is finished or during the test, the corresponding electric connection disconnection disassembly position in the disassembly conductor 903 can be plugged and sealed by the ball shield 906, so that the sharp angle of the conductor at the plugging position is avoided from being ignited through smooth transition between the outer Zhou Humian of the ball shield 906 and the surface of the plug contact 904.
If the transformer related test is performed first, the straight pipe conductor 902 and the detachable conductor 903 connected to the transformer end are connected to the ball head, and the other detachable conductor 903 connected to the GIS device end is detached. The test device is internally connected with a test sleeve equalizing ball 905 at the other side of the straight pipe conductor 902, then an external pipe shell is sleeved on the straight pipe conductor 902 and the plug contact 904 to form a complete test device, the test device is connected to a high-voltage switch interface flange in a sealing way, and the test device is connected and fastened by bolts. And the other end of the test device shell is provided with a pressure equalizing cover at the end of the test sleeve pressure equalizing ball 905, and a sleeve cover plate is used for sealing the connecting end between the field test device and the test sleeve 901. And after the installation is finished, sulfur hexafluoride gas is filled into the test device and the high-voltage switch pipeline, and after the insulation air pressure reaches the test requirement, the test device can carry out a pressurization test on the test sleeve.
After the transformer test is finished, if the high-voltage switch test is required, sulfur hexafluoride gas in the pipeline can be drained correspondingly, then the shell component is removed reversely according to the installation steps, and then the straight pipe conductor 902 is connected with the dismounting conductor 903 connected to the GIS equipment in a conducting manner correspondingly, and the dismounting conductor 903 connected to the transformer side is removed. After the internal conductor of the field test device is installed, the external tube shell component is correspondingly connected to provide an airtight space for filling sulfur hexafluoride insulating gas for a pressurization test. In the compression test, the electrical signals of the respective test device are still introduced into the field test device via the test bushing and then conducted to the high-voltage switch side via the conductors of the newly connected conductor structure inside the field test device.
After the test is finished, the test sleeve, the shell of the field test device, the straight pipe conductor 902 internally fed with test voltage and other test conductors can be removed. Then, a ball shield 906 is installed on the end face of the plug interface of the plug contact 904, which is originally connected with the dismounting conductor 903, so as to restore the normal connection of the internal conductor of the pipeline between the transformer and the high-voltage switch through the plug contact 904, and after the normal connection is completed, the cover plate is installed on the interface flange, and sulfur hexafluoride insulating gas is filled to provide gas insulation for the transformer in a working state.
In other implementations, the switching all-in-one machine of the present application may be configured to connect the high-voltage outlet end of the transformer 1 with the GIS device 6 through the gas-insulated pipeline 4. The gas-insulated tubing 4 may be connected to the high-voltage outlet terminal of the transformer by a high-voltage oil-SF 6 bushing 2. Wherein the gas insulated pipe 4 and the high pressure oil-SF 6 bushing 2 need to avoid the position of the transformer oil tank. The three-phase high-pressure oil-SF 6 bushing 2 of the transformer can be correspondingly arranged on one side of the long axis of the transformer box structure so as to shorten the installation length of the gas insulation pipeline 4 connected to the GIS equipment;
each phase of high-voltage outgoing line of the transformer is respectively connected with an independent high-pressure oil-SF 6 sleeve pipe 2, the high-pressure oil-SF 6 sleeve pipe 2 connected with each phase of high-pressure outgoing line can be vertically arranged on one side of a long shaft of the transformer box body along the top of the transformer box body, and the tail parts of the high-pressure oil-SF 6 sleeve pipes 2 of each phase can be respectively arranged to sink into the main body structure of the transformer. The transformer main body structure can also be provided with a transformer hand hole at the top of the side wall of the box body so as to extend into the interior of the transformer box body through the hand hole processing and installing tool, thereby reliably connecting the high-pressure oil-SF 6 sleeve 2 with the high-pressure outlet line of the transformer so as to reduce the overall height of the transformer and GIS equipment;
The neutral point outlet end of the transformer can be horizontally connected with a neutral point oil-SF 6 sleeve 8 along the short axis side of the main body structure of the transformer so as to connect a gas-insulated neutral point grounding device with the neutral point of the transformer and provide overload protection;
each phase of the low-voltage outlet end of the transformer can be converged at the bottom of the same low-voltage oil-gas separation device 3, and is connected to a low-voltage GIL pipeline through a three-phase common box mode by a low-voltage lifting seat outlet wire of the transformer;
the connection between the transformer and the closed GIL hard tube, between the transformer and the high-pressure oil-SF 6 bushing 2, and between the transformer and the GIS device can be achieved through the gas-insulated pipeline 4 shown in fig. 3. The GIL hard tube shown in fig. 3 may be connected to the three-phase high-pressure oil-SF 6 bushing 2 of the transformer through three transverse sealing pipeline connection ports 701 disposed on the same side thereof, respectively, and the other end of the GIL hard tube may be connected to a field test apparatus of the transformer in a three-phase common box manner, so as to receive test signals through an inner conductive core of the test apparatus and conduct the transformer and the test signals according to test requirements, or conduct the GIS device and the test signals. And after the test device is disassembled, the disassembled open port can be sealed through the flange cover plate, and the port is used as an overhaul port.
In this embodiment, the main structure of the gas-insulated pipe 4 is preferably configured as a three-phase common box type to compress the installation space required for the pipe. Specifically, in the three-phase common-box pipeline structure, the three-phase outgoing lines can be converged into a pipeline through the common-box conductive inner core in the pipeline by adopting the conductor connection mode shown in fig. 4. The three-phase conductors arranged in the common box can be disassembled and assembled through the insulating pipe hand holes 702 on the side wall of the gas insulating pipeline. Referring specifically to fig. 4, the conductive core of the three-phase common box pipeline is formed by combining a three-phase straight barrel conductor 801, a transfer conductor 802 and an insulator contact 803. The end of the straight tube conductor 801 can be inserted and fixed in the basin-type insulator 804 to realize fixation and support, and the other end of the basin-type insulator can transmit electric signals to the conductor in the next section of pipeline through the insulator contact 803, and the other end of the basin-type insulator can also be connected to the inner conductor in the transformer field test device through the insulator contact 803 to realize interaction of test signals. Any phase conductor in the gas insulated pipeline 4 shown in fig. 4 can be fixedly connected to the high-voltage oil-SF 6 sleeve 2 of the transformer through bolts in a corresponding branch port through a high-voltage interface. After the fastening of the bolts is completed, a metal shielding cover surrounding the end part of the bushing battery cell can be arranged at the joint position of the conductor in the high-voltage oil-SF 6 bushing 2 of the transformer, so that the bolts and the sharp corners of the conductor are surrounded in the metal shielding cover, and the phenomenon of tip discharge of the conductor in the running process is prevented. During specific installation, the outside of the metal shielding cover can be correspondingly provided with a sleeve hand hole on the side wall of the sleeve so as to observe the specific installation condition of the conductive structure in the sleeve.
The utility model provides a specific circuit structure to GIS equipment 6 does not have too much restriction, and it can arrange in a flexible way and share the case generating line, GIS earthing switch, isolator, circuit breaker, GIS current transformer, cable termination, GIS arrester, voltage transformer, the concrete relation of connection between GIS switch board etc. according to the opening becomes all-in-one performance requirement. And all components of the GIS equipment can be combined into a whole through the gas insulation pipeline and the external mounting bracket for supporting the insulation pipeline. The above-mentioned GIS device is generally disposed in parallel on the long side of the transformer 1 near the high-pressure oil-SF 6 sleeve 2 along the direction parallel to the high-pressure outlet side in cooperation with the high-pressure outlet side of the transformer main structure, and each electrical element in the GIS device may be sequentially connected in series by a metal pipe. The specific selected electrical element types in the GIS equipment and the specific arrangement mode and connection relation among the electrical elements have no fixed requirements, so long as the GIS equipment functions can be realized. The components in the GIS equipment are preferably arranged along a straight line, so that the circuit function can be realized more compactly, the waste of the installation space is reduced, and the material cost of the pipeline hardware structure is reduced. The GIS equipment pipe bus running direction is correspondingly adjusted according to the outer limit sizes of the transformer and the transformer installation site, so that the transformer and the transformer installation site are matched with each other. Each specific component in the GIS equipment can be produced in a factory prefabrication mode, and then is installed in a modularized mode during a processing end or a field test.
The test device 5 in this embodiment, as a test tool for a new structure of the switching integrated machine, may be disposed at a connection transition position between the gas insulated pipeline 4 and the GIS device 6 in a manner shown in fig. 6. The experimental device consists of a test tube nut and a test sleeve 901. Wherein, three-phase test sleeve 901 is the ox horn form and expandes respectively, and the electrified part of test sleeve 901 needs to satisfy minimum air insulation interval requirement. The inside of the test tube can correspondingly test the transformer product or GIS equipment by changing the connection state of the conductors. Fig. 6 and 5 illustrate the connection relationship of the internal conductor structure of the test tube matrix by taking one phase conductor as an example. The test tube female inner conductor structure consists of components such as a straight tube conductor 902, a dismounting conductor 903, a plug contact 904, a test tube voltage-equalizing ball 905, a ball head shielding 906 and the like. If the transformer related test is performed first, the dismounting conductor 903 of the communication GIS device shown in the second state diagram from the left in fig. 6 can be removed, and other components can be kept normally connected. If the GIS device related test is performed first, the dismounting conductor 903 shown in the first state diagram from the left in fig. 6 is removed, so that other components can be kept normally connected. After the test, the detachable conductor 903 attached to the test sleeve 901 can be removed as shown in the third state diagram from the left in fig. 6. At this point, the remaining post-test device 5 may optionally be removed or may optionally remain in the apparatus to provide an electrical connection path through the remaining conductor structure for subsequent service testing. In each of the above states, the removed side of the plug contact 904 is required to be provided with a ball shield 906 having a smooth arc structure to prevent discharge during product operation.
The transformer apparatus and the GIS system in the foregoing embodiments may be matched with each other, and directly welded and fixed to the same common base sleeve foundation platform 9, so as to realize the overall assembly and handling. The common base platform 9 may be configured as a steel plate having a certain thickness, and the bottom of the common base platform may be combined into a set of frame by the steel plate and the section steel, and the openings for accommodating the field wiring may be reserved in the frame structure according to the transformer, the GIS device and the corresponding neutral point device and the specific installation position. The public foundation platform 9 can be fixedly connected with a construction site foundation in a direct welding mode, so that a transformer, a test device, corresponding GIS equipment and neutral point equipment are firmly fixed on the test site, and stable electric connection paths among the equipment are ensured.
In summary, the application uses sulfur hexafluoride gas as an insulating medium, and a field experiment device capable of flexibly changing a circuit communication mode is arranged in a gas insulating pipeline between a transformer and a high-voltage switch, so that electric connection is flexibly provided for the transformer, GIS equipment and corresponding test equipment according to test requirements. Therefore, the gas insulation pipeline can compress the insulation distance required by the field experimental device, and the conductor paths can be flexibly switched through the conductive cores and the conductive tee structures in the field experimental device, so that the switching between different test states and working states is realized, the preparation process of test lines and material equipment before the test is simplified, the test efficiency is improved, and the test cost is saved. The field test device can be used for providing an electric path between the transformer and the GIS equipment for the switching-on and switching-off integrated machine in a normal working state after detecting the high-voltage switch and the transformer, so that the idle waste of the test device can be effectively avoided, and convenience is brought to daily maintenance work.
The foregoing is merely exemplary of embodiments of the present application and is thus not to be construed as limiting the scope of the present application. It should be noted that it would be apparent to those skilled in the art that various modifications and improvements could be made without departing from the spirit of the present application, which would be within the scope of the present application.
Claims (10)
1. The field experimental device of the switching all-in-one machine is characterized in that the field experimental device is in sealing connection in a gas insulation pipeline (4) between a transformer (1) and GIS equipment (6), and comprises:
one end of the conductive core is detachably and electrically connected with the test equipment, and the other end of the conductive core is detachably connected with a conductive tee structure;
the conductive tee joint is structurally and detachably connected with two conductors, one conductor is connected with the inner core of the gas insulation pipeline (4) at one side of the transformer (1), and the other conductor is connected with the inner core of the gas insulation pipeline (4) at one side of the GIS equipment (6);
when a transformer field test is carried out, one end of the conductive core is electrically connected with test equipment, one of the conductive tee structures at the other end is connected with one of the conductors to be electrically connected with the transformer (1), and the other conductor is detached to disconnect the electrical connection with GIS equipment (6);
When a high-voltage switch field test is carried out, one end of the conductive core is electrically connected with test equipment, the conductive tee structure at the other end is disassembled to disconnect the electrical connection between one of the conductors and the transformer (1), and the other conductor is connected to keep the electrical connection with GIS equipment (6);
in any power-on state, the field experiment device and the gas insulation pipeline (4) are kept to be internally communicated, and the conducting core, the conducting tee structure and the pipelines of the two paths of conductors are filled with insulation gas meeting the test air pressure requirement.
2. The on-site experiment device of the all-in-one switching machine according to claim 1, wherein in a non-experiment state, a conductive core in the on-site experiment device is removed from a gas insulation pipeline (4), and a transformer (1) is electrically connected with GIS equipment (6) through a conductive tee structure and a conductor which are sealed in the gas insulation pipeline (4).
3. The on-site experiment device of the all-in-one switch machine according to claim 1, wherein the conductive core is a straight pipe conductor (902) with two ends respectively provided with a plug connector, the plug connector at one end of the straight pipe conductor is connected with a test sleeve equalizing ball (905), and the plug connector at the other end of the straight pipe conductor is connected with a conductive tee structure;
One side of the test sleeve voltage equalizing ball (905) is connected with the straight pipe conductor (902) in a plugging mode, the other side of the test sleeve voltage equalizing ball is electrically connected with the test sleeve (901), and the test sleeve (901) is electrically connected with corresponding test equipment.
4. A field experimental device of a switching all-in-one machine according to claim 3, wherein the conductive tee joint structure is a plug contact (904) provided with three groups of plug interfaces, the surface of the plug contact (904) is provided with a smooth spherical surface, and the three groups of plug interfaces are respectively concave in different directions.
5. The on-site experiment device for the all-in-one switch as claimed in claim 4, wherein the plug contact (904) is arranged at a bending part of the gas insulation pipeline (4), a detachable conductor (903) is respectively connected between the plug contact (904) and each path of conductor and between the plug contact (904) and the straight pipe conductor (902), and the detachable conductor (903) is electrically connected with the plug interface in a plugging manner.
6. The all-in-one field test device according to claim 5, wherein in the non-test state, the detachable conductor (903) between the plug contact (904) and the straight conductor (902) is detached to disconnect the electrical connection;
When a transformer field test is carried out, the dismounting conductor (903) between the plug contact (904) and the conductor connected with the GIS equipment (6) is dismounted to be disconnected electrically, and the dismounting conductor (903) between the plug contact (904) and the conductor connected with the transformer (1) is plugged to be kept electrically connected;
when the high-voltage switch field test is carried out, the dismounting conductor (903) between the plug contact (904) and the conductor connected with the transformer (1) is dismounted to disconnect the electric connection, and the dismounting conductor (903) between the plug contact (904) and the conductor connected with the GIS equipment (6) is plugged to maintain the electric connection.
7. The field experimental device of a switch-in-one machine according to claim 5, wherein the plug connector (904) is further provided with a plug connector for plugging and closing the plug connector (904) at the disassembly position of the disassembly conductor (903) by a ball shield (906), and the outer peripheral surface of the ball shield (906) is in smooth transition with the surface of the plug connector (904).
8. A field test method for a field test device of an all-in-one machine, which is used for installing the field test device of any one of claims 1-7, and comprises the following steps:
before the field test of the transformer is carried out, firstly discharging insulating gas in the field test device, dismantling the electric connection between the conductive tee structure and the conductor connected with the GIS equipment (6), keeping the electric connection between the conductive tee structure and the conductor connected with the transformer (1), and then supplementing the insulating gas into the field test device to recover to meet the test air pressure requirement;
When the high-voltage switch field test is carried out, firstly, insulating gas in the field test device is exhausted, electric connection between the conductive tee structure and a conductor connected with the transformer (1) is disassembled, electric connection between the conductive tee structure and the conductor connected with the GIS equipment (6) is kept, and then the insulating gas is supplemented into the field test device to recover to meet the test air pressure requirement;
the field experimental device is electrically connected with the experimental equipment through the experimental sleeve (901).
9. The field test method according to claim 8, wherein when the device is switched to the non-test state, the insulating gas in the field test device is exhausted first, the electrical connection between one end of the conductive core and the test device is removed, the electrical connection between the conductive three-way structure and the conductor connected with the GIS device (6) and the conductor connected with the transformer (1) is maintained, and then the insulating gas is supplemented into the field test device to restore the device to meet the operation air pressure requirement.
10. A field test method according to claim 9, characterized in that in the non-test state the test sleeve (901) to which the test device is connected is removed from the field test device or remains at the end of the field test device.
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| CN116593845B (en) * | 2023-07-06 | 2023-12-05 | 江苏安靠智能输电工程科技股份有限公司 | Transformer and GIS equipment test device |
| CN117906889B (en) * | 2024-03-20 | 2024-05-10 | 江苏沃能电气科技有限公司 | Intelligent detection and analysis system for performance of insulating tubular bus |
| CN119178910B (en) * | 2024-11-26 | 2025-04-04 | 江苏安靠智电股份有限公司 | An intelligent switching device for GIS/GIL insulation test |
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